Two unlike dislocations, gliding in parallel slip planes in the channel of a persistent slip band, were considered. They were initially kept apart in straight screw positions. As the dislocations were pushed in opposite directions by the applied stress between 2 walls, they bowed out and attracted one another to form a dipole. With increasing stress, the dislocations became more and more curved until they separated. The walls of the channel were represented by the elastic fields of rigid edge dipoles. The dislocations were modelled as planar curves, approximated by moving polygons. The objective of the simulations was to determine the stress, in the channel, which was required for the dislocations to escape one another. The stress- and strain-controlled regimes which were considered provided upper and lower estimates for the escape stress. The results were compared with dislocation dynamics estimates.

Interactions of Glide Dislocations in a Channel of a Persistent Slip Band. J.Křišťan, J.Kratochvíl: Philosophical Magazine, 2007, 87[29], 4593-613